class Bird(object):
    def __init__(self):
        self.hungry = True
    def eat(self):
        if self.hungry:
            print "Aaaaa..."
            self.hungry = False
        else:
            print "No, thanks!"


class Other(object):
    def __init__(self):
        self.age = 23


class SongBird(Bird, Other):
    def __init__(self):
        super(SongBird, self).__init__()
        # will not call Other.__init__(), Bird.__init__() overwrite Other's.
        self.sound = "Squawk!"
    def sing(self):
        print self.sound
